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Ina Formation Kobayashi and Shikama, 1949
Invalid name: lower Tenryu Group
- Type locality: Mount Tsukueyama, Takagi city, Shimoina county, Nagano prefecture
- Coherent formation
- Pliocene
- Lithofacies: Gravels
- Lithofacies (Minor): Sands, Clay, Lignite
- Thickness: ca. 100 m
- Upper limit: Unconformity (Tenryu Gravel Bed)
- Lower limit: Unconformity (Granite)
- Ina Formation
- [ Upper ]
- ~~~~~~~~~~~~~~
- Main part
- --------------
- Misobeta Member
- --------------
- [ Lower ]
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Mount Tsukueyama, Takagi city, Shimoina county, Nagano pref.; Horikoshi, Toyooka city, Shimoina county, Nagano pref.
- Fossils (Plants): Alnus sp., Carex sp., Juglans cinerea var. megacinerea, Metasequoia sp.
- Kawata and Yamada (1957) Iida, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 50p. (in Japanese with English abstract 12p.)